Study of vertical wind profiles in an urban area w

Authors: N PEGAHFAR A A BIDOKHTI P ZAWARREZA M M FARAHANI

Publish Date: 2011/11/12

Volume: 120, Issue: 5, Pages: 825-841

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Abstract

In this paper monthly trends of vertical wind profiles within and above an urban area with complex topography Tehran have been investigated using data from a Sodar a 100m and two 28m towers and some surface stations It includes the occurrence evolution dissipation time peak time and maximum height for katabatic–anabatic winds due to topography return flow and urban circulation Vertical distributions of wind and the heat and momentum fluxes up to 600 m were also consideredThe vertical wind profiles which have diurnal and seasonal variations show southwesterly daily anabatic wind and northeasterly nocturnal katabatic wind Daily vertical wind profile structure which has two layers and two jets contains a decrease approximately at 300–400 m which may be due to the return flow and a daily thermal convective flow in the urban convergent terrain At night the nocturnal wind profile structure in the majority of months has two layers and sometimes three layers containing northeasterly flows In two layers structure a decrease can be seen between two layers In three layers structure the middle layer has a different direction that indicates the return flow and urban circulation more clearly Katabatic flows also develop in successive phases varying from 1 to 3 phases in different months Investigation on surface wind demonstrates that in cold months a drainage flow from a valley located in the west of the station can affect wind speed and direction especially at evening transition time These flow patterns can influence the way air pollutants disperse in this area

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